問題詳情
3.右圖中電流 I 在封閉而且對稱的迴路上穩定流動，圓弧的半徑有 a、b 兩種，a＜b，中心點 P 處的磁場為： 
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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